Abstract
Vaporization studies on pure (E)- p-dimethylaminoazobenzene (hereafter indicated as DAB) and the DAB-choleic acid (DCADAB) were accomplished by means of the torsion effusion method. The pressure of the vapour in equilibrium with the solid phase was determined for DAB as log P (kPa) = (15.05±0.18)−(6887±500)/ T and by the second-law treatment of the vapour pressure data a Δ H 0 381 = 132±8 kJ mol −1 was obtained for DAB vaporization from the pure compound. Since the tensimetric data of DCADAB lie at the limit of the instrument's working range only a rough value of Δ H 0 435 = 138 kJ mol −1 was obtained for DAB vaporization from DCADAB. This finding agrees with the strong DAB—DCA interactions found in the DCADAB crystal structure.
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